BUG: load extensions in IPython magic (#1543)
BUG: load extensions in IPython magic (#1543)


Scapogo/zipline,alphaBenj/zipline,enigmampc/catalyst,bartosh/zipline,humdings/zipline,humdings/zipline,quantopian/zipline,enigmampc/catalyst,quantopian/zipline,bartosh/zipline,Scapogo/zipline,florentchandelier/zipline,florentchandelier/zipline,alphaBenj/zipline